"A posteriori" redirects here. For the Enigma album, see
A Posteriori. The terms "a priori" and "a posteriori" are used in
philosophy to distinguish between
deductive and
inductive reasoning, respectively. Attempts to define clearly or explain a priori and a posteriori knowledge are part of a central thread in
epistemology, the study of
knowledge. Since the definitions and usage of the terms have been corrupted over time and therefore vary between fields, it is difficult to provide universal definitions of them. One rough and oversimplified explanation is that a priori knowledge is independent of
experience, while a posteriori knowledge is dependent on experience. In other words, statements that are a priori true are
tautologies.
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